量子通信类.pptx

1.文献讲解会汇报 Finite-key analysis for measurement-device-independent quantum key distribution（测量设备无关的量子密钥分配有限重点分析）2.实际与理想的差别Quantum key distribution promises unconditionally secure communications. However, as practical devices tend to deviate from their specifications, the security of some practical systems is no longer valid. 3.QKD系统和 mdiQKD系统 In particular, an adversary can exploit imperfect detectors to learn a large part of the secret key, even though the security proof claims otherwise. a practical approach—measurement-device-independent quantum key distribution.4.实际QKD系统安全问题和改进方法问题：1.face implementation loopholer, or so-called side channels;例子：recent attacks against certain commerical QKD systems;潜在方法：1.(理论上合理，实际操作难度很大） 2.（代表系统：diQKD 系统，不大现实）5.mdiQKD系统 It is fully practical and feasible to implement. Its feasibility has been demonstrated both in laboratories and via field tests. 优点：1. 2. 3.小缺点：1.（也不构成问题）6.mdiQKD系统的局限性 So far ,the security of mdiQKD has been only proven in the asymptotic regime.(渐进要求），which assumes that Alice and Bob have access to an unlimited amount of resources , or in the finite regime but only against particular types of attacks. In summary, the feasibility of long-distance implementations of mdiQKD within a reasonable time frame of signal transmission has remained undemonstrated.7.mdiQKD系统作用及困难作用1.作用2.困难：here a challenge is to estimate the transmittance and the quantum bit error rate of the single-photon component of the signal at the presence of high losses.解决方法：use the Chernoff bound as it provides good bounds for the above parameters even in the high-loss regime. 7、Finite-key%20analysis%20for%20measurement-device-independent%20quantum%20key%20distribution-刘康、朱建荣组会讲解%20-%20副本.pdf8.7、Finite-key%20analysis%20for%20measurement-device-independent%20quantum%20key%20distribution-刘康、朱建荣组会讲解%20-%20副本.pdfSecurity definition file:///C:\Users\Administrator\Desktop\刘康课题\7、Finite-key%20analysis%20for%20measurement-device-